The following discussion and analysis of our financial condition and results of
operations should be read in conjunction with our Annual Report on Form 10-K for
the year ended December 31, 2020, filed with the SEC on March 31, 2021, or our
Annual Report, as well as our unaudited condensed consolidated financial
statements and related notes included in this Quarterly Report on Form 10-Q, or
this Quarterly Report.

Forward-Looking Statements

This report contains forward-looking statements and information within the
meaning of Section 27A of the Securities Act of 1933, as amended, or the
Securities Act, and Section 21E of the Securities Exchange Act of 1934, as
amended, or the Exchange Act, which are subject to the "safe harbor" created by
those sections. These forward-looking statements include, but are not limited
to, statements concerning our strategy, future operations, future financial
position, future revenues, projected costs, prospects and plans and objectives
of management. The words "anticipate," "believe," "could," "designed,"
"estimate," "expect," "intend," "may," "plan," "potential," "project," "will,"
"would," and similar expressions are intended to identify forward-looking
statements, although not all forward-looking statements contain these
identifying words. We may not actually achieve the plans, intentions or
expectations disclosed in our forward-looking statements and you should not
place undue reliance on our forward-looking statements. Actual results or events
could differ materially from the plans, intentions and expectations disclosed in
the forward-looking statements that we make. These forward-looking statements
involve risks and uncertainties that could cause our actual results to differ
materially from those in the forward-looking statements, including, without
limitation, the risks set forth in Part II, Item 1A, "Risk Factors" in this
Quarterly Report on Form 10-Q, Part I, Item 1A, "Risk Factors" in our Annual
Report and in our other filings with the SEC. The forward-looking statements are
applicable only as of the date on which they are made, and we do not assume any
obligation to update any forward-looking statements.

Overview



We are a clinical stage biopharmaceutical company focused on discovering and
developing novel, controllable cellular immunotherapies for various forms of
cancer, including both hematological cancers and solid tumors. We are advancing
CAR-T cell therapies, which are an innovative approach in which a patient's or
donor's T cells are genetically modified to carry chimeric antigen receptors, or
CARs. We are using our proprietary Chemical Induction of Dimerization, or CID,
technology platform to engineer our product candidates with switch technologies
that are designed to control components of the immune system in real time. By
incorporating our CID platform, our product candidates may offer better efficacy
and safety outcomes than are seen with current cellular immunotherapies.

Cell behavior is controlled by cascades of specialized signaling proteins. CID
consists of molecular switches, modified forms of these signaling proteins,
which are triggered inside the patient by infusion of a small molecule, instead
of by natural upstream signals. We genetically introduce these molecular
switches into the appropriate immune cells and deliver the cells to the patient
in the manner of conventional cellular immunotherapy. We have developed two such
switches: an "activation switch," designed to stimulate activation,
proliferation and persistence of the immunotherapy cells and provide other
immunomodulatory benefits, and a "safety switch," designed to initiate
programmed cell death, or apoptosis, of the immunotherapy cells. Each of our
product candidates incorporates one or both switches, for enhanced, real time
control of efficacy and safety:

•The inducible MyD88/CD40 (iMC) activation switch that is incorporated into our
GoCAR product candidates is designed to enhance CAR-based cell therapies by
augmenting multiple mechanisms of action, including: 1) boosting effector cell
proliferation; 2) enhancing functional persistence by resisting exhaustion and
inhibitory signals found in the tumor microenvironment; and 3) stimulating the
cancer patient's own immune system to intensify tumor killing. Unlike other CAR
therapies that can behave unpredictably due to their autonomous activity, GoCAR
antitumor effects are controlled through scheduled administration of rimiducid.
In the event of severe side effects, GoCAR activity can be attenuated by
extending the interval between rimiducid doses or suspending further rimiducid
administration.

•Our CaspaCIDe™ safety switch (also known as inducible Caspase-9, or iC9) is
designed to be inactive unless the patient experiences a serious side effect
(e.g., CRS, neurologic toxicities or off-tumor / on-target toxicities). In that
event, rimiducid or temsirolimus is administered to induce Caspase-9 and
eliminate the cells, with the goal of attenuating the therapy and resolving the
serious side effect.

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•Some of our product candidates are "dual-switch" GoCARs that are designed to
provide a user-controlled system for managing proliferation, persistence and
safety of tumor antigen-specific CAR cells by incorporating both our iMC and
CaspaCIDe switches.

By incorporating our novel switch technologies, we are developing product candidates with the potential to elicit positive clinical outcomes and ultimately change the treatment paradigm in various areas of cellular immunotherapy. Our most advanced programs are described below.



•BPX-601 is an autologous GoCAR-T product candidate containing our proprietary
iMC activation switch, designed to treat solid tumors expressing prostate stem
cell antigen, or PSCA. We believe iMC enhances T cell proliferation and
persistence, enhances host immune activity, and modulates the tumor
microenvironment to improve the potential to treat solid tumors compared to
traditional CAR-T therapies. A Phase 1/2 clinical trial, called BP-012, in
patients with metastatic castration-resistant prostate cancer or pancreatic
cancer expressing PSCA is ongoing.

•BPX-603 is an autologous dual-switch GoCAR-T product candidate containing both
the iMC activation and CaspaCIDe safety switches. BPX-603 is our first
controllable dual-switch GoCAR-T product candidate and is designed to target
solid tumors that express the human epidermal growth factor receptor 2 antigen,
or HER2. A Phase 1/2 clinical trial called BPX-603-201A in patients with HER2+
solid tumors is ongoing.

•Rivo-cel (rivogenlecleucel, formerly known as BPX-501), is a product candidate
containing our proprietary CaspaCIDe safety switch that is intended to improve
outcomes of hematopoietic stem cell transplantation in the treatment of
hematologic malignancies and inherited blood disorders. We are pursuing a
strategic partner for rivo-cel to assume future development and
commercialization responsibilities. Concurrently, we have reduced and expect to
continue to reduce our rivo-cel related activities.

We have developed efficient and scalable processes to manufacture genetically
modified T cells of high quality, which are currently being used to generate
products for our clinical trials. We are leveraging this know how in combination
with our proprietary cellular control technologies, resources, capabilities and
expertise for the manufacture of CAR product candidates to create and develop
first and best-in-class product candidates.

On May 5, 2021, we were notified by Nasdaq that we were in breach of Listing
Rule 5450(b)(2)(A) (the "Market Value Rule") for continued listing on The Nasdaq
Capital Market because the market value of our listed securities for 30
consecutive business days had been less than $35 million. In accordance with
Nasdaq Listing Rule 5810(c)(3)(C), we were granted a grace period until November
1, 2021, to regain compliance with the Market Value Rule by maintaining a market
value of listed securities $35 million or more for a minimum of 10 consecutive
business days any time prior to November 1, 2021. On November 2, 2021, Nasdaq
notified us that we had not regained compliance with the Market Value Rule by
November 1, 2021, and unless we request a hearing before the Nasdaq Hearings
Panel (the "Panel") by November 9, 2021, our securities will be delisted from
Nasdaq. We intend to timely request a hearing before the Panel to appeal this
determination, which we expect will stay any further action by Nasdaq until the
conclusion of the hearing process.

Impact of COVID-19



In 2019, a novel strain of coronavirus, which causes COVID-19, was identified.
Due to the rapid and global spread of the virus, on March 11, 2020, the World
Health Organization declared the COVID-19 outbreak a pandemic. To slow the
proliferation of COVID-19, governments have implemented extraordinary measures,
which have included the mandatory closure of businesses, restrictions on travel,
and quarantine and physical distancing requirements. We have not experienced and
do not anticipate a substantial impact to our operations as a result of the
pandemic or these government measures. However, depending the duration and
severity of the pandemic, we could experience impact in the future, including
with respect to the operations of our manufacturing partners, clinical trial
sites and regulatory agencies, all of which we are substantially dependent upon
for our business. We are continuing to closely monitor the impact of the
COVID-19 pandemic on our business.
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Results of Operations
The following table sets forth a summary of our statement of operations for the
periods indicated:
                                              Three Months Ended                                                        Nine Months Ended
(in thousands)                  September 30, 2021          September 30, 2020           Change          September 30, 2021          September 30, 2020           Change
Revenues
Supply agreement              $             -              $                -          $     -          $              700          $                -          $    700
License revenue                         5,000                               -            5,000                       5,000                           -             5,000
Total revenues                          5,000                               -            5,000                       5,700                           -             5,700
Operating expenses:
Research and development                6,348                           8,140           (1,792)                     19,531                      30,346           (10,815)
General and administrative              1,681                           4,163           (2,482)                      5,458                      12,095            (6,637)
Total operating expenses                8,029                          12,303           (4,274)                     24,989                      42,441           (17,452)
(Gain) loss on dispositions,
net                                        14                               -               14                         478                      (3,761)            4,239
Loss from operations                   (3,043)                        (12,303)           9,260                     (19,767)                    (38,680)           18,913
Other income (expense):
Interest income                             6                              10               (4)                         24                         392              (368)
Interest expense                            -                            (725)             725                          (4)                     (2,473)            2,469
Change in fair value of
warrant and private placement
option liabilities                      4,264                          12,131           (7,867)                      7,506                      14,256            (6,750)
Other income                                6                               -                6                           5                           -                 5
Total other income (expense)            4,276                          11,416           (7,140)                      7,531                      12,175            (4,644)
Net income (loss)             $         1,233              $             (887)         $ 2,120          $          (12,236)         $          (26,505)         $ 14,269



Revenues

The increase in revenues for the three months ended September 30, 2021, compared
to the same periods last year, was related to the license agreement with The
University of Texas M. D. Anderson Cancer Center ("MD Anderson") for certain
option and license rights to CaspaCIDe and related technologies. An upfront fee
under the agreement of $5.0 million was recognized as revenue. This constitutes
a majority of the revenue increase for the nine months ended September 30, 2021,
together with the supply agreement with Takeda Development Center Americas, Inc.
(Takeda) for the supply of rimiducid for potential use in clinical trials of
TAK-007 (CD19 CAR-NK cell therapy). The supply was fulfilled in the second
quarter of 2021 generating revenue of $0.7 million.

Research and Development Expenses (R&D)



The decrease in R&D expenses for the three months ended September 30, 2021,
compared to the same period last year, was primarily due to reduced expenses
related to the sale of the manufacturing facility, and the reduction in force
that was implemented during the second half of 2020. This resulted in a $3.4
million reduction in salaries, benefits, travel, and share-based compensation
related charges. This was partially offset by a $1.1 million increase in
sublicense payment as a result of the license agreement with Baylor College of
Medicine. There was also a $0.5 million increase in clinical trial cost and
associated consulting expenses.

The decrease in R&D expenses for the nine months ended September 30, 2021,
compared to the same period last year, was primarily due to reduced expenses
related to the sale of the manufacturing facility, and the reduction in force
that was implemented during the second half of 2020. This resulted in a $9.9
million reduction in salaries, benefits, travel, and share-based compensation
related charges, and a $0.3 million reduction from general R&D expenses
primarily due to lower clinical trial activities. Additionally, depreciation
expense and R&D related overhead expense decreased by $0.6 million due to the
exit of manufacturing facility, related laboratories and office space.

General and Administrative Expenses (G&A)


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The decrease in G&A expenses for the three months ended September 30, 2021,
compared to the same period last year, was primarily due to the aforementioned
reduction in force that reduced employee-related charges by $1.7 million as well
as the reduction in clinical facility and depreciation expenses by $0.8 million
related to exit of manufacturing facility and office space.

The decrease in G&A expenses for the nine months ended September 30, 2021,
compared to the same period last year, was primarily due to the aforementioned
reduction in force that reduced employee-related charges by $4.9 million as well
as the reduction in clinical facility and depreciation expenses by $1.7 million
related to exit of manufacturing facility and office space.

Loss (gain) on dispositions, net



The loss on dispositions, net, for the three months ended September 30, 2021,
compared to the same period last year, was a result of early termination of the
operating lease for office equipment with a lump sum payment. The increase in
the loss on dispositions, net, for the nine months ended September 30, 2021 was
primarily from the loss on the termination of the South San Francisco office
space in the amount of $0.5 million, whereas in the same period last year, there
was a gain on disposal of the clinical supply manufacturing facility to M.D.
Anderson.

Other Income (Expense)

Other expense primarily consists of interest expense, partially offset by
interest income, and changes in fair values of our warrant liability and the
private placement option, which are remeasured at each reporting period. Due to
the nature of the inputs in the model used to assess the fair value of the
warrant liability and private placement option, we may experience significant
fluctuations at each reporting period. These fluctuations may be due to a
variety of factors, including changes in our stock price and changes in stock
price volatility over the remaining term of the warrants and options.

The decrease in other income for the three months ended September 30, 2021,
compared to the same period last year, was primarily due to a $4.3 million gain
recognized from the change in fair value of our warrant and private placement
option liabilities, compared to $12.1 million gain in the same period last year.
The gain recognized during the three months ended September 30, 2021 was driven
primarily by a decrease in our stock price over the period.

The decrease in other income for the nine months ended September 30, 2021,
compared to the same period last year, was primarily due to a $7.5 million gain
recognized from the change in fair value of our warrant and private placement
option liabilities, compared to $14.2 million gain in the same period last year.
The gain recognized during the nine months ended September 30, 2021 was driven
primarily by a decrease in our stock price over the period.

Liquidity and Capital Resources

Going Concern and Management's Plans



The accompanying consolidated financial statements have been prepared on the
basis that we will continue as a going concern, which contemplates realization
of assets and the satisfaction of liabilities in the normal course of business.
As of September 30, 2021, we had cash, cash equivalents and restricted cash of
$20.8 million and net cash used in operations of approximately $17.1 million for
the nine months ended September 30, 2021.

Our cash resources are primarily consumed by operating activities and we expect
negative cash flows from operations to continue for at least the next 12 months.
Our primary uses of capital are, and we expect will continue to be, compensation
and related expenses, third-party clinical research and development services,
laboratory and related supplies, clinical costs, legal and other regulatory
expenses and general overhead costs. Based on our current research and
development plans and our timing expectations related to the progress of our
programs, we believe there is substantial doubt that our cash and cash
equivalents will be sufficient to fund our operating expenses and capital
expenditure requirements into the second half of 2022.

We plan to continue to attempt to obtain future financing and/or engage in
strategic transactions, but we cannot predict, with certainty, the outcome of
our actions to generate liquidity, including the availability of additional
equity or debt financing, or whether such actions would generate the expected
liquidity as currently planned. To continue as a going concern, we may postpone
or eliminate some of our research and development programs and reduce our
administrative costs. We may also intend to seek additional funding including,
but not limited to any or all of the following potential sources:

We have an effective shelf registration statement on Form S-3 for the offer and
sale of up to $400.0 million of our securities, of which approximately $290.5
million remains available for future offerings. We may pursue additional funding
through the sale of our securities in one or more offerings under this
registration statement, however we cannot assure you that we will be able to do
so on favorable terms. Our ability to offer and sell our securities in a primary
offering on our Form S-3 is currently limited by Instruction I.B.6 of Form S-3,
commonly referred to as the "baby shelf" limitation. If we raise additional
capital through the
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sale of equity or convertible debt securities, the ownership interests of our
stockholders will be diluted, and the terms may include liquidation or other
preferences that could adversely affect the rights of our existing stockholders.
If we raise additional capital through the issuance of debt securities, we could
incur fixed payment obligations and become subject to certain restrictive
covenants, including limitations on our ability to incur additional debt and
acquire or license intellectual property rights, and other operating
restrictions that could restrict our ability to conduct our business.

In addition, we may receive additional capital through the exercise of
outstanding warrants to purchase our stock if our stock price sufficiently
increases. As of September 30, 2021, warrants to purchase 5,750,000 shares of
our Series 1 preferred stock at an exercise price of $130.00 per share
(equivalent to $13.00 per share of common stock) and warrants to purchase
4,149,378 shares of our common stock at an exercise price of $6.50 per share
were outstanding. The preferred stock warrants expire on August 21, 2026 and the
common warrants expire on November 3, 2025.

As a result of the COVID-19 pandemic and actions taken to slow its spread, the
global credit and financial markets have experienced extreme volatility,
including diminished liquidity and credit availability, declines in consumer
confidence, declines in economic growth, increases in unemployment rates and
uncertainty about economic stability. There can be no assurance that further
deterioration in credit and financial markets and confidence in economic
conditions will not occur. If equity and credit markets deteriorate, it may make
any necessary debt or equity financing more difficult to obtain, more costly
and/or more dilutive. Moreover, if we do not obtain such additional funds, there
could be substantial doubt about our ability to continue as a going concern and
increased risk of insolvency, which could result in a total loss of investment
to our stockholders and other security holders.

Cash Flows

Operating Activities



Net cash used in operating activities during the nine months ended September 30,
2021 was $17.1 million compared to $43.3 million for the same period last year.
The changes in cash flow from operating activities during the nine months ended
September 30, 2021 were due to $12.2 million of net losses, a non-cash gain of
$7.5 million recognized from the change in the derivative warrant and private
placement option fair value liability and a $0.5 million decrease from changes
in operating assets and liabilities. This was partially offset by $2.6 million
of share-based compensation and $0.1 million of depreciation expense.

Investing Activities



Net cash provided by investing activities during the nine months ended
September 30, 2021 was $0.9 million compared to $14.1 million for the same
period last year. The change in cash flow from investing activities during the
nine months ended September 30, 2021 was due to $0.9 million net proceeds
received from the sale of property and equipment. Cash provided by investing
activities for the same period last year was due to $14.9 million of proceeds
from the sale of property and equipment.

Financing Activities



Net cash used in financing activities during the nine months ended September 30,
2021 was less than $0.1 million on financing lease obligations compared to net
cash used in financing activities of $10.0 million for the same period last year
primarily due to principal debt repayments.

Critical Accounting Policies and Estimates



There have been no material changes to the Company's critical accounting
policies and use of estimates from those disclosed in the Company's Form 10-K
for the year ended December 31, 2020. For a discussion of our critical
accounting policies and use of estimates, refer to Management's Discussion and
Analysis of Financial Condition and Results of Operations - Critical Accounting
Policies and Significant Estimates in Part II, Item 7 of our Annual Report on
Form 10-K for the year ended December 31, 2020.

Recent Accounting Pronouncements

The Company is subject to several recently issued accounting pronouncements. Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies - New Accounting Requirements and Disclosures which is contained in Part I,


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